Quantum light source device and optical system including the same

Patent metadata

Field	Value
Publication number	US-2025216609-A1
Application number	US-202418975769-A
Country	US
Kind code	A1
Filing date	Dec 10, 2024
Priority date	Dec 27, 2023
Publication date	Jul 3, 2025
Grant date	—

Abstract

Disclosed are a quantum light source device and an optical system including the same. The quantum light source device includes a substrate, a buffer layer provided on the substrate, and an optical waveguide layer provided on the buffer layer and including a signal waveguide and a resonant waveguide adjacent to one side of the signal waveguide. The resonant waveguide includes a periodic polarization inversion structure having a plurality of polarizations periodically inverted.

First claim

What is claimed is:

1 . A quantum light source device comprising:
a substrate; a buffer layer provided on the substrate; and an optical waveguide layer provided on the buffer layer and including a signal waveguide and a resonant waveguide adjacent to one side of the signal waveguide, wherein the resonant waveguide comprises a periodic polarization inversion structure having a plurality of polarizations periodically inverted.

2 . The quantum light source device according to claim 1 , wherein the optical waveguide layer comprises lithium niobate.

3 . The quantum light source device according to claim 1 , wherein the resonant waveguide comprises:
a main resonant waveguide adjacent to the signal waveguide; and an auxiliary resonant waveguide spaced apart from the signal waveguide and disposed adjacent to the main resonant waveguide.

4 . The quantum light source device according to claim 3 , further comprising:
a first outer resonant electrode provided out of the main resonant waveguide; and a first inner resonant electrode provided in the main resonant waveguide adjacent to the first outer resonant electrode.

5 . The quantum light source device according to claim 4 , further comprising:
a second outer resonant electrode provided out of the auxiliary resonant waveguide; and a second inner resonant electrode provided in the auxiliary resonant waveguide adjacent to the second outer resonant electrode.

6 . The quantum light source device according to claim 5 , wherein the first and second outer resonant electrodes comprise heater electrodes.

7 . The quantum light source device according to claim 3 , wherein the main resonant waveguide comprises:
a first main resonant waveguide; and a second main resonant waveguide provided in the first main resonant waveguide.

8 . The quantum light source device according to claim 3 , wherein the auxiliary resonant waveguide comprises:
a first auxiliary resonant waveguide; and a second auxiliary resonant waveguide provided in the first auxiliary resonant waveguide.

9 . The quantum light source device according to claim 1 , further comprising:
a third outer resonant electrode provided out of the resonant waveguide and in one side of the periodic polarization inversion structure; and a third inner resonant electrode provided in the resonant waveguide and in another side of the periodic polarization inversion structure.

10 . The quantum light source device according to claim 1 , wherein each of the signal waveguide and the resonant waveguide comprise a ridge waveguide.

11 . An optical system comprising:
a light source configured to generate pump light; a quantum light source device configured to use the pump light to generate a photon pair; and a light detector configured to detect the photon pair, wherein the quantum light source device comprises:
a substrate;
a buffer layer provided on the substrate; and
an optical waveguide layer provided on the buffer layer and comprising a signal waveguide and a resonant waveguide adjacent to one side of the signal waveguide,
wherein the resonant waveguide comprises a periodic polarization inversion structure having a plurality of polarizations periodically inverted.

12 . The optical system according to claim 11 , wherein each of the signal waveguide and the resonant waveguide comprises a ridge waveguide.

13 . The optical system according to claim 11 , wherein the optical waveguide layer comprises lithium niobate.

14 . A quantum light source device comprising:
a signal waveguide; a resonant waveguide provided at one side of the signal waveguide; and a periodic polarization inversion structure provided on the resonant waveguide and having polarizations periodically inverted.

15 . The quantum light source device according to claim 14 , wherein the resonant waveguide comprises:
a main resonant waveguide adjacent to the signal waveguide; and an auxiliary resonant waveguide spaced apart from the signal waveguide and disposed adjacent to the main resonant waveguide.

16 . The quantum light source device according to claim 15 , further comprising:
a first outer resonant electrode provided out of the main resonant waveguide; and a first inner resonant electrode provided in the main resonant waveguide adjacent to the first outer resonant electrode; a second outer resonant electrode provided out of the auxiliary resonant waveguide; and a second inner resonant electrode provided in the auxiliary resonant waveguide adjacent to the second outer resonant electrode.

17 . The quantum light source device according to claim 15 , wherein the main resonant waveguide comprises:
a first main resonant waveguide; and a second main resonant waveguide provided in the first main resonant waveguide.

18 . The quantum light source device according to claim 15 , wherein the auxiliary resonant waveguide comprises:
a first auxiliary resonant waveguide; and a second auxiliary resonant waveguide provided in the first auxiliary resonant waveguide.

Assignees

• Electronics & Telecommunications Res Inst
• Korea Advanced Inst Sci & Tech

Inventors

• Moon Kiwon
• Hwang Hyeon
• Seo Min-Kyo
• Lee Hansuek
• Ju Jung Jin
• Kim Min-Su
• Kim Hong-Seok
• Park Jaegyu
• Slusar Tetiana
• Kim Jinwoo
• Kim Jin Tae
• Park Jiho

Classifications

• G02F2203/15

  involving resonance effects, e.g. resonantly enhanced interaction · CPC title

• G02F1/225 Primary

  in an optical waveguide structure · CPC title

• G02B2006/12061

  Silicon · CPC title

• G02B2006/12121

  Laser · CPC title

• G02B2006/12138

  Sensor · CPC title